Type instance micro-benchmark comparison

output.txt

TL;DR: use isinstance for subclass-friendly type checks unless microperf is needed, then use type is or type in (set) as needed

Timings on 3.11-3.13

3.11:

wrong: 0.01907933602342382s
isinstance: 0.03639550699153915s
isinstance (multiple types tuple): 0.0790955779957585s
in set: 0.05437163001624867s
in tuple: 0.07667801500065252s
any set: 0.39473058498697355s
any tuple: 0.38263560098130256s

3.12

wrong: 0.020254609000403434s
isinstance: 0.04267390904715285s
isinstance (multiple types tuple): 0.08680826798081398s
in set: 0.0511601020116359s
in tuple: 0.07611375296255574s
any set: 0.4684364930144511s
any tuple: 0.4442763639963232s

3.13

wrong: 0.02352760697249323s
isinstance: 0.03476412297459319s
isinstance (multiple types tuple): 0.07270792697090656s
in set: 0.044357359991408885s
in tuple: 0.06767950300127268s
any set: 0.4882963169948198s
any tuple: 0.423168417008128s

test.py

import timeit

from ansible.template.jinja_bits import AnsibleUndefined, DeferredErrorMarker
from ansible.template.templar import TemplateContext, Templar
from ansible.utils.datatag.tags import TrustedAsTemplate


class AnotherOne(DeferredErrorMarker):
    """bleh"""

tc = TemplateContext(template_value="blah", templar=Templar(), options=None, stop_on_template=False).__enter__()

undefined_types = {AnsibleUndefined, DeferredErrorMarker, AnotherOne}
undefined_types_tuple = tuple(undefined_types)
value = TrustedAsTemplate().tag('hello')  # AnotherOne(exception=Exception())

def in_undefined_set(v):
    return type(value) in undefined_types

def in_undefined_tuple(v):
    return type(value) in undefined_types_tuple

def any_undefined_set(v):
    value_type = type(value)
    return any(value_type is t for t in undefined_types)

def any_undefined_tuple(v):
    value_type = type(value)
    return any(value_type is t for t in undefined_types_tuple)

print(f"wrong: {timeit.timeit('type(value) is AnsibleUndefined', globals=globals())}s")
print(f"isinstance: {timeit.timeit('isinstance(value, AnsibleUndefined)', globals=globals())}s")
print(f"isinstance (multiple types tuple): {timeit.timeit('isinstance(value, undefined_types_tuple)', globals=globals())}s")
print(f"in set: {timeit.timeit('in_undefined_set(value)', globals=globals())}s")
print(f"in tuple: {timeit.timeit('in_undefined_tuple(value)', globals=globals())}s")
print(f"any set: {timeit.timeit('any_undefined_set(value)', globals=globals())}s")
print(f"any tuple: {timeit.timeit('any_undefined_tuple(value)', globals=globals())}s")